/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_NOSPEC_ASM_H
#define _ASM_S390_NOSPEC_ASM_H

#include <linux/linkage.h>
#include <linux/export.h>
#include <asm/dwarf.h>

#ifdef __ASSEMBLER__

#ifdef CC_USING_EXPOLINE

/*
 * The expoline macros are used to create thunks in the same format
 * as gcc generates them. The 'comdat' section flag makes sure that
 * the various thunks are merged into a single copy.
 */
        .macro __THUNK_PROLOG_NAME name
#ifdef CONFIG_EXPOLINE_EXTERN
        SYM_CODE_START(\name)
#else
        .pushsection .text..\name,"axG",@progbits,\name,comdat
        .globl \name
        .hidden \name
        .type \name,@function
\name:
        CFI_STARTPROC
#endif
        .endm

        .macro __THUNK_EPILOG_NAME name
#ifdef CONFIG_EXPOLINE_EXTERN
        SYM_CODE_END(\name)
        EXPORT_SYMBOL(\name)
#else
        CFI_ENDPROC
        .popsection
#endif
        .endm

        .macro __THUNK_PROLOG_BR r1
        __THUNK_PROLOG_NAME __s390_indirect_jump_r\r1
        .endm

        .macro __THUNK_EPILOG_BR r1
        __THUNK_EPILOG_NAME __s390_indirect_jump_r\r1
        .endm

        .macro __THUNK_BR r1
        jg      __s390_indirect_jump_r\r1
        .endm

        .macro __THUNK_BRASL r1,r2
        brasl   \r1,__s390_indirect_jump_r\r2
        .endm

        .macro  __DECODE_R expand,reg
        .set .L__decode_fail,1
        .irp r1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
        .ifc \reg,%r\r1
        \expand \r1
        .set .L__decode_fail,0
        .endif
        .endr
        .if .L__decode_fail == 1
        .error "__DECODE_R failed"
        .endif
        .endm

        .macro  __DECODE_RR expand,rsave,rtarget
        .set .L__decode_fail,1
        .irp r1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
        .ifc \rsave,%r\r1
        .irp r2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
        .ifc \rtarget,%r\r2
        \expand \r1,\r2
        .set .L__decode_fail,0
        .endif
        .endr
        .endif
        .endr
        .if .L__decode_fail == 1
        .error "__DECODE_RR failed"
        .endif
        .endm

        .macro __THUNK_EX_BR reg
        exrl    0,555f
        j       .
555:    br      \reg
        .endm

#ifdef CONFIG_EXPOLINE_EXTERN
        .macro GEN_BR_THUNK reg
        .endm
        .macro GEN_BR_THUNK_EXTERN reg
#else
        .macro GEN_BR_THUNK reg
#endif
        __DECODE_R __THUNK_PROLOG_BR,\reg
        __THUNK_EX_BR \reg
        __DECODE_R __THUNK_EPILOG_BR,\reg
        .endm

        .macro BR_EX reg
557:    __DECODE_R __THUNK_BR,\reg
        .pushsection .s390_indirect_branches,"a",@progbits
        .long   557b-.
        .popsection
        .endm

        .macro BASR_EX rsave,rtarget
559:    __DECODE_RR __THUNK_BRASL,\rsave,\rtarget
        .pushsection .s390_indirect_branches,"a",@progbits
        .long   559b-.
        .popsection
        .endm

#else
        .macro GEN_BR_THUNK reg
        .endm

         .macro BR_EX reg
        br      \reg
        .endm

        .macro BASR_EX rsave,rtarget
        basr    \rsave,\rtarget
        .endm
#endif /* CC_USING_EXPOLINE */

#endif /* __ASSEMBLER__ */

#endif /* _ASM_S390_NOSPEC_ASM_H */